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Wndows 7 SP1 fails to install error: 0x800f0a12

Question

I downloaded sp1 from technet today. Installed it on 2 computers. All fine. But the third had a problem. Almost imediatly after you click next an error comes: 0x800f0a12. below is from the end of the log:

Try to add a drive letter to the 'system reserved' partition (unassing after complete SP1 installation).Hello!

Monday, February 21, 2011 8:47 AM

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